Welcome, Betty.
a couple of thoughts. Plants grow without people being involved. Part of how they do it is to throw lots of attempts out there. In a natural system the area would be overrun with squash very quickly if all the seeds one plant produced were to germinate successfully. Nature accepts loses and plans accordingly.
You could just take your squash seeds and toss them into your garden plot tomorrow and take your chances on what happens next. In fact, if I were in your place, I would probably do just that. But I like to experiment and I would think of any squash plants that came from this one as a sort of bonus
People tend to want a higher success rate from the things they plant than Nature expects from her efforts, and so we do things to give our seeds a better chance. We take them in where animals are less likely to get to them. Dry them against fungus and other rots. We start them carefully in special pots, or hold off planting them until the weather is favorable for their kind. We do all this because we want as high a germination rate as we can get.
We put lots of work into getting that high germination rate. At the same time, one of the ideas with permaculture gardening is to try and do as little as possible. To let the natural order handle as much of the work as possible.
Self-seeding annuals are one of the ways to achieve this. For example, let us say you plant your squash seeds in the spring after the last frosts, and you have a good year with numerous squash in the fall. When you harvest, you miss a couple that are hidden under he big leaves. Critters get to them, chew them up, eat some seeds, stash some seeds, knock some seeds around and scuffle them into the dirt a bit. Come spring, some of those forgotten stash seeds start sprouting. Some of those scuffled under the dirt pop up in another place. You have squash growing again, and you did not do a thing, except Not harvest one or two fruit last fall.
How you do your garden depends on many things and there are many different ways hat work. People choose to maximize different elements, resulting in different approaches. It is all good.